Air compressor having buffering compartment

ABSTRACT

An air compressor assembly includes a cylinder housing, an outlet receptacle disposed on the cylinder housing, and a partition having an air passage formed between the cylinder housing and the outlet receptacle, and a piston slidably received in the cylinder housing for generating a pressurized air, the partition includes a channel communicating with the chamber of the cylinder housing, and the cylinder housing includes a compartment formed in a casing and communicating with the channel of the partition for partially receiving the pressurized air and for buffering purposes. A regulating valve is engaged in the casing for adjusting the volume of the compartment of the casing.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to an air compressor assembly, and moreparticularly to an air compressor assembly including a cylinder housinghaving a compressing chamber for slidably receiving or engaging with apiston and having a buffering compartment formed in the cylinder housingand communicating with the compressing chamber of the cylinder housingfor partially receiving the pressurized air or for receiving a portionof the pressurized air and for buffering purposes and for allowing thepiston head to effectively compress or pump the air in the pumpingmovement or stroke and/or for suitably increasing the compressing orpumping or pressurizing effect or operation to the air.

2. Description of the Prior Art

Typical air compressors comprise a cylinder housing attached or securedto a base and having a piston slidably disposed in a compressing chamberthereof, and a motor secured to the base and coupled to the piston ofthe cylinder housing for actuating or driving the piston of the cylinderhousing in a reciprocating action, in order to generate a pressurizedair of a greater air pressure and a decreased flowing quantity and forsupplying the pressurized air to inflate various air facilities, such astires, air beds, air cushions, hovercrafts, etc.

The cylinder housing normally includes an outlet receptacle having acompartment formed therein and having one or more outlet portscommunicating with the compartment of the outlet receptacle forselectively or changeably attaching and securing or coupling variousparts or elements or attachments or facilities, such as the pressuregauges, the air nozzles, the relief valves, the safety valves or thelike.

The applicant has developed various kinds of typical air compressors,including at least U.S. Pat. No. 6,213,725 to Chou, U.S. Pat. No.6,514,058 to Chou, U.S. Pat. No. 6,655,928 to Chou, U.S. Pat. No.6,846,162 to Chou, U.S. Pat. No. 7,240,642 to Chou, and U.S. Pat. No.7,462,018 to Chou each of which also comprise a piston slidably disposedwithin a compressing chamber of a cylinder housing, a spring valvehaving one end secured to the piston and having the other end forselectively blocking an air aperture of the piston, in order to controlthe air to flow through the piston, and a motor secured to the base andcoupled to the piston of the cylinder housing for actuating or drivingor forcing the piston of the cylinder housing to move in thereciprocating action relative to the cylinder housing, and an outletreceptacle extended or formed on top of the cylinder housing and havinga compartment formed therein for receiving the pressurized air from thecylinder housing and having one or more outlet ports communicating withthe compartment of the outlet receptacle for selectively or changeablyattaching and securing or coupling various parts or elements orattachments or facilities, such as the pressure gauges, the air nozzles,the relief valves, the safety valves or the like.

The piston head of the piston normally includes a solid structure havinga planar driving or forcing or actuating surface for forcing or pushingor compressing or pumping the air in the pumping movement or stroke inorder to generate the pressurized air.

However, the compressing chamber of the cylinder housing includes asolid structure having no other space or cavity or chamber orcompartment formed in the cylinder housing for partially receiving thepressurized air such that the piston may not be effectively movedrelative to the cylinder housing and may not be effectively operated tocompress or pump the air in the pumping movement or stroke and such thatthe piston may have a good chance to generate a pressurized air havingan over-pressurized condition.

The present invention has arisen to mitigate and/or obviate theafore-described disadvantages of the conventional structures for the aircompressors.

SUMMARY OF THE INVENTION

The primary objective of the present invention is to provide an aircompressor assembly including a cylinder housing having a compressingchamber for slidably receiving or engaging with a piston and having abuffering compartment formed in the cylinder housing and communicatingwith the compressing chamber of the cylinder housing for partiallyreceiving the pressurized air or for receiving a portion of thepressurized air and for buffering purposes and for allowing the pistonhead to effectively compress or pump the air in the pumping movement orstroke and/or for suitably increasing the compressing or pumping orpressurizing effect or operation to the air.

In accordance with one aspect of the invention, there is provided an aircompressor assembly comprising a cylinder housing including a chamberformed therein and defined by an inner peripheral surface, an outletreceptacle provided on the cylinder housing and including a bore formedtherein, and including a partition provided between the cylinder housingand the outlet receptacle, and including an air passage formed in thepartition and communicating with the chamber of the cylinder housing forreceiving a pressurized air from the chamber of the cylinder housing,and communicating with the bore of the outlet receptacle, and includinga valve seat formed between the cylinder housing and the outletreceptacle, a piston slidably received in the chamber of the cylinderhousing, a motor coupled to the piston for moving the piston relative tothe cylinder housing in a reciprocating action in order to generate apressurized air and for allowing the pressurized air to be supplied fromthe chamber of the cylinder housing to the bore of the outletreceptacle, and a spring-biased check valve disposed in the outletreceptacle and engaged with the valve seat and the partition forselectively blocking the air passage of the partition and for guidingthe pressurized air to flow from the chamber of the cylinder housinginto the bore of the outlet receptacle, and to prevent the pressurizedair from flowing backwardly from the bore of the outlet receptacle intothe chamber of the cylinder housing, the partition includes a channelformed therein and communicating with the chamber of the cylinderhousing, and the cylinder housing includes a casing having a compartmentformed in the casing and communicating with the channel of the partitionfor partially receiving the pressurized air and for buffering purposes,and the piston includes a predetermined or selected length and is offsetor spaced and separated from the partition of the cylinder housing for adistance (D) when the piston is moved toward the partition at a top deadposition, for forming and defining a space between the piston and thepartition and for partially receiving the pressurized air.

The cylinder housing includes a regulating valve engaged in thecompartment of the casing for adjusting a volume of the compartment ofthe casing. The regulating valve includes an adjusting member threadedand engaged with the casing for adjusting the volume of the compartmentof the casing. The adjusting member includes a peripheral depressionformed in an outer peripheral portion for receiving and engaging with asealing ring.

The cylinder housing includes a spacing or separating wall or panelprovided between the casing and the outlet receptacle for spacing andseparating the compartment of the casing and the bore of the outletreceptacle from each other. The outlet receptacle includes a ductcommunicating with the bore of the outlet receptacle for receiving thepressurized air from the bore of the outlet receptacle.

The cylinder housing includes a relief valve having a valve piecedisposed and engaged in the duct for selectively blocking an air passagebetween the duct and the outlet receptacle, and a fastener threaded andengaged with the duct for selectively enclosing the duct and forretaining the valve piece in the duct, the fastener includes an orificeformed therein, and an actuating knob includes a shank slidably engagedin the orifice of the fastener and contactable and engageable with thevalve piece for selectively depressing the valve piece to selectivelyrelieve the pressurized air. The valve piece includes a cone shapedstructure having at least one notch for forming and defining at leastone blade and for air relieving or dissipating purposes.

The cylinder housing includes a cover detachably attached to the outletreceptacle, and the cover includes a stem extended therefrom forengaging into the outlet receptacle and for engaging with thespring-biased check valve and for retaining the spring-biased checkvalve within the outlet receptacle. The stem includes at least oneperipheral recess formed in an outer peripheral portion for forming anddefining at least one peripheral flange and for engaging with at leastone sealing ring.

Further objectives and advantages of the present invention will becomeapparent from a careful reading of the detailed description providedhereinbelow, with appropriate reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of an air compressor assembly in accordancewith the present invention;

FIG. 2 is a cross sectional view of the air compressor assembly, takenalong lines 2-2 of FIG. 1;

FIG. 3 is another cross sectional view similar to FIG. 2, illustratingthe operation of the air compressor assembly;

FIG. 4 is a partial perspective view illustrating some of the parts orelements of the air compressor assembly;

FIG. 5 is a partial exploded view of the air compressor assembly;

FIG. 6 is an enlarged partial cross sectional view of the air compressorassembly;

FIG. 7 is another partial cross sectional view of the air compressorassembly, taken along lines 7-7 of FIG. 6; and

FIG. 8 is a further cross sectional view similar to FIGS. 2 and 3,illustrating the operation of the relief valve device for the aircompressor assembly; and

FIG. 9 is a still further cross sectional view similar to FIGS. 3-4 and8, illustrating the adjusting operation of the regulating valve of theair compressor assembly.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

Referring to the drawings, and initially to FIGS. 1-3, an air compressorassembly in accordance with the present invention comprises an outerreceptacle or housing or container 90 including a supporting lower orbottom container member 91 and an upper covering member 92 openablyattached or mounted or secured or coupled or anchored or retained orposition together to form and to provide a chamber or compartment orspace 93 in the container 90 for receiving or accommodating an aircompressor device 1. As shown in FIGS. 2-5, the air compressor device 1includes a supporting base 10 including a supporting plate 11 and acylinder housing 20 provided on or extended from the supporting plate 11and preferably, but not necessarily formed integral with the supportingplate 11.

For example, the supporting plate 11 and the cylinder housing 20 may beformed integral with each other, as shown in FIGS. 4 and 5, with themolding or mold-injection processes, for example, or alternatively, thecylinder housing 20 may include one or more projections (not shown)extended therefrom and engaged with corresponding hubs or tubularmembers (not shown) of the supporting plate 11 for detachably attachingor mounting or securing the cylinder housing 20 to the supporting plate11. The cylinder housing 20 includes a chamber 21 formed therein andformed or defined by an inner peripheral surface 29 for slidablyreceiving or engaging with a piston 30 which includes an extension orpiston rod 31 extended from the piston 30 and slidable in areciprocating action in the chamber 21 of the cylinder housing 20 forgenerating a pressurized air.

A gear 12 is rotatably attached to the lower portion of the supportingplate 11 with one or more bearings (not shown) and a shaft 13, and aneccentric member 14 is attached or secured to the gear 12 with such asfasteners (not shown) or with the molding or mold-injection processesand may thus be rotated in concert with the gear 12, and includes acrank or an eccentric pin 15 extended therefrom and coupled to a freeend portion of the piston rod 31 of the piston 30 (FIGS. 2-5, 8-9) inorder to actuate or to move the piston 30 relative to the cylinderhousing 20 in reciprocating actions. A motor 16 (FIGS. 4-5) may beattached or secured to the upper portion of the supporting plate 11 withsuch as fasteners (not shown), and includes a spindle 17 (FIGS. 2, 8)extended through the supporting plate 11, and includes a pinion 18secured to the spindle 17 thereof.

As also shown in FIGS. 2 and 8, the pinion 18 of the motor 16 is meshedor engaged with the gear 12 for allowing the gear 12 to be pivoted orrotated or driven by the motor 16 with the pinion 18, and thus forallowing the piston 30 to be actuated to move relative to the cylinderhousing 20 in the reciprocating actions by the eccentric member 14 andthe eccentric pin 15. A fan device 19 (FIGS. 4-5) may further beprovided and coupled to the motor 16 for being rotated or driven by themotor 16 to generate a circulating or ventilating air. The cylinderhousing 20 includes an outlet tube or barrel or receptacle 40 extendedupwardly or outwardly from the top thereof, and having a compartment orbore 41 formed therein (FIGS. 2-3, 6) and communicating with the chamber21 of the cylinder housing 20, for receiving the pressurized air fromthe chamber 21 of the cylinder housing 20.

For example, the cylinder housing 20 includes an upper panel or wall orpartition 22 disposed or formed or provided between the cylinder housing20 and the outlet receptacle 40 and includes an air pathway or conduitor passage 23 formed in the partition 22 for allowing the pressurizedair to be supplied from the chamber 21 of the cylinder housing 20 to thebore 41 of the outlet receptacle 40, and includes a valve seat 24 formedor provided between the cylinder housing 20 and the outlet receptacle40, such as formed or provided in the partition 22 and between the airpassage 23 of the partition 22 and the bore 41 of the outlet receptacle40. The outlet receptacle 40 further includes one or more ducts 42, 43,44 (FIG. 7) extended outwardly therefrom and communicating with the bore41 of the outlet receptacle 40, for receiving the pressurized air fromthe bore 41 of the outlet receptacle 40.

The ducts 42, 43, 44 may be coupled to various kinds of facilities thatrequire pressurized air supplied thereto. For example, a nozzle (notshown) may be provided and attached to one of the ducts 42 with a hose45 (FIGS. 4-5, 7) for allowing the pressurized air to be supplied fromthe chamber 21 of the cylinder housing 20 and the bore 41 of the outletreceptacle 40 to various pneumatic facilities that require pressurizedair supplied thereto, with the nozzle. The hose 45 may be received orengaged or contained or retained in the space 93 of the container 90.The container 90 includes a switch 94 formed or provided therein(FIG. 1) for actuating or operating the air compressor device 1. Apressure gauge 46 may further be provided and attached to the other duct44 (FIGS. 4-5, 7) for detecting and showing the air pressure within thecylinder housing 20 and/or the outlet receptacle 40, and may be providedand exposed outwardly through the container 90 (FIG. 1) for being viewedand read by the users.

A spring-biased check valve 47 (FIGS. 2-3, 6, 8-9) is disposed in theother duct 48 of the outlet receptacle 40 or directly in the outletreceptacle 40, or on top of the partition 22 of the cylinder housing 20,and engaged with the partition 22 or the valve seat 24 that is formed orprovided between the outlet receptacle 40 and the cylinder housing 20for selectively blocking or enclosing or sealing the air passage 23 ofthe partition 22, and the spring-biased check valve 47 may be used tolimit and to guide the pressurized air to flow only from the chamber 21of the cylinder housing 20 into the bore 41 of the outlet receptacle 40,and to prevent the pressurized air from flowing backwardly from the bore41 of the outlet receptacle 40 into the chamber 21 of the cylinderhousing 20. The above-described structure or configuration for the aircompressor assembly is typical and is not related to the presentinvention and will not be described in further details.

The air compressor device 1 includes a lid or cap or cover 60 foropenably or detachably attaching or mounting or securing to the otherduct 48 of the outlet receptacle 40, and the cover 60 includes a rod orextension or shank or stem 61 extended therefrom for engaging with orinto the other duct 48 of the outlet receptacle 40 and for selectivelycontacting or engaging with the spring-biased check valve 47 and forsolidly and stably anchoring or retaining or positioning thespring-biased check valve 47 within the other duct 48 of the outletreceptacle 40, and the stem 61 includes one or more (such as two)peripheral recesses 62 formed in the outer peripheral portion thereof(FIG. 6) for forming or defining one or more (such as two) peripheralribs or flanges 63 and for receiving or engaging with gaskets or sealingrings 64, and the cover 60 includes a knob or button or handle oractuating member or hand grip 65 for rotating or driving the cover 60relative to the other duct 48 of the outlet receptacle 40.

A safety valve or relief valve 5 (FIGS. 2-9) may be provided andattached to another duct 43 for relieving the pressurized air when theair pressure within the cylinder housing 20 and/or the outlet receptacle40 is over a predetermined pressure, and thus for preventing thecylinder housing 20 and/or the outlet receptacle 40 from beingover-pressurized and damaged. For example, the relief valve 5 includes asoft or spring or resilient valve piece 50 disposed or engaged in theduct 43 for selectively blocking or enclosing or sealing or controllingthe air passage between the duct 43 and the outlet receptacle 40. Thevalve piece 50 includes a substantially semi-spherical or dome or coneshaped structure or configuration having one or more voids or notches 51formed therein for forming or defining one or more blades 52 and for airrelieving or dissipating purposes.

The relief valve 5 further includes a screw or bolt or fastener 53threaded or engaged with the duct 43 for selectively enclosing orsealing or locking the duct 43 and for solidly and stably anchoring orretaining or positioning the valve piece 50 in the duct 43 and forpreventing the valve piece 50 from being disengaged or separated fromthe duct 43 inadvertently. The fastener 53 includes an aperture or boreor pathway or orifice 54 formed therein for slidably receiving orengaging with a stem or rod or extension or shank 56 of an actuatingmember or button or knob 55, in which the shank 56 of the actuating knob55 is contactable or engageable with the valve piece 50 for selectivelycompressing or depressing or operating or actuating or forcing the valvepiece 50 (FIG. 8) to selectively relieve the pressurized air when theair pressure within the cylinder housing 20 and the outlet receptacle 40is over a predetermined value, by compressing or operating or actuatingor depressing the actuating knob 55.

It is to be noted that the provision or the extension of the ducts 42,43, 44, 48 from the outlet receptacle 40 allows the relief valve 5 andthe pressure gauge 46 and the nozzle to be easily and readily attachedto or coupled to the outlet receptacle 40 with the ducts 42, 43, 44, 48without additional or specialized coupling members or tools. One or morecovers or caps lids (not shown) may further be provided and attached orsecured to either of the ducts 42, 43, 44, 48 with such as a threadingengagement, for selectively enclosing or blocking the ducts 42, 43, 44,48 when the ducts 42, 43, 44, 48 are not required to be used, or whenthe relief valve 5 and the pressure gauge 46 and the nozzle are notattached or secured to the ducts 42, 43, 44, 48.

In operation, as shown in FIGS. 2 and 3, the piston 30 may be actuatedor moved relative to the cylinder housing 20 in the reciprocatingactions by the motor 16 with the pinion 18, the gear 12, the eccentricmember 14 and the eccentric pin 15, in order to generate a pressurizedair, and to allow the pressurized air to flow into the outlet receptacle40, and then to flow out through either or all of the ducts 42, 43, 44,48, and thus to allow the air pressure within the cylinder housing 20and/or the outlet receptacle 40 to be detected and shown by the pressuregauge 46, and to allow the pressurized air to be supplied into thefacilities that require pressurized air supplied thereto, with thenozzle, and/or to allow the pressurized air to be relieved via therelief valve 5 when the cylinder housing 20 and/or the outlet receptacle40 is over-pressurized.

Referring again to FIGS. 2-9, the outlet receptacle 40 and/or thecylinder housing 20 includes a further duct or casing 49 extendedoutwardly therefrom, such as extended outwardly from the outletreceptacle 40 or from the cylinder housing 20 and having a chamber orspace or cavity or compartment 490 formed therein (FIGS. 7-9) forreceiving or engaging with another relief valve or safety valve orregulating valve 7, and the compartment 490 of the casing 49 is offsetor spaced or separated from the bore 41 of the outlet receptacle 40 witha separating wall or panel 25; i.e., the outlet receptacle 40 and/or thecylinder housing 20 includes a separating wall or panel 25 for spacingor separating the compartment 490 of the casing 49 and the bore 41 ofthe outlet receptacle 40 from each other and for preventing thepressurized air from flowing from the bore 41 of the outlet receptacle40 into the compartment 490 of the casing 49.

The cylinder housing 20 further includes a channel 26 formed therein,such as formed in the partition 22 and communicating with the chamber 21of the cylinder housing 20 and also communicating with the compartment490 of the casing 49 for allowing the compartment 490 of the casing 49to partially receive the pressurized air and/or to receive a portion ofthe pressurized air for buffering purposes when the piston 30 is movedtoward the partition 22, and for allowing the piston 30 to effectivelycompress or pump the air in the pumping movement or stroke and/or forsuitably increasing the compressing or pumping or pressurizing effect oroperation to the air. The regulating valve 7 includes a screw or bolt orfastener or adjusting member 70 threaded or engaged with the casing 49for adjusting the space or size or dimension or volume of thecompartment 490 of the casing 49.

In operation, as shown in FIGS. 7-9, when the adjusting member 70 isthreaded or pivoted or rotated relative to the casing 49, the adjustingmember 70 may be adjusted or moved relative to the casing 49 foradjusting the space or size or dimension or volume of the compartment490 of the casing 49 that may be used to partially receive thepressurized air and/or to receive a portion of the pressurized air forbuffering purposes when the piston 30 is moved toward the partition 22.The adjusting member 70 includes a peripheral depression 71 formed inthe outer peripheral portion thereof for receiving or engaging with agasket or sealing ring 72 and for forming an air tight seal between theadjusting member 70 and the casing 49.

It is preferable, but not necessary that the piston 30 includes apredetermined or selected length and is spaced or separated from thepartition 22 of the cylinder housing 20 for a space or distance (D) whenthe piston 30 is moved toward the partition 22 at the top dead center orposition as shown in FIG. 3, and thus for forming or defining a selectedarea or cavity or chamber or compartment or space 27 between the piston30 and the partition 22 when the piston 30 is moved toward the partition22 at the top dead center or position, and the space 27 that is formedor provided between the piston 30 and the partition 22 may also be usedto partially receive the pressurized air and/or to receive a portion ofthe pressurized air for buffering purposes when the piston 30 is movedtoward the partition 22.

The size or dimension or standard or volume of the compartment 490 ofthe casing 49 or the distance (D) between the piston 30 and thepartition 22 when the piston 30 is moved toward the partition 22 at thetop dead center or position as shown in FIG. 3 may be calculated ordetermined or obtained with the following equation: D=S/(P=1), in whichthe item (S) is the moving stroke of the piston 30 as shown in FIG. 3,and P is a constant or a ratio between the greatest pressure of thepressurized air to be generated and the atmospheric or barometricpressure which is 1 atm=101.325 kpa. For example, when the greatestpressure of the pressurized air to be generated is predetermined orselected or set at 350 kpa, the constant P=350 kpa/101.325 kpa=3.45. Themoving stroke (S) of the piston 30 is predetermined or selected or setas 16, then the distance (D) may be calculated or determined orobtained: D=16/(3.45−1)=6.53.

The greatest pressure of the pressurized air to be generated may bedifferent or predetermined or selected or set other than 350 kpa, andthe moving stroke (S) of the piston 30 and the space 27 that is formedor provided between the piston 30 and the partition 22 may bepredetermined or selected or set and may be selectively changed, and theadjusting member 70 may also be adjusted or moved relative to the casing49 for adjusting the space or size or dimension or volume of thecompartment 490 of the casing 49 that is communicating with the chamber21 of the cylinder housing 20 and thus for adjusting the space or sizeor dimension or volume to partially receive the pressurized air and/orto receive a portion of the pressurized air for buffering purposes whenthe piston 30 is moved toward the partition 22.

In operation, as shown in FIGS. 2-3 and 6-9, when the piston 30 isactuated to move relative to the cylinder housing 20 in thereciprocating actions in order to generate the pressurized air, andparticularly when the piston 30 is moved toward the partition 22, thecompartment 490 of the casing 49 that is communicating with the chamber21 of the cylinder housing 20 may be used to partially receive thepressurized air and/or to receive a portion of the pressurized air forbuffering purposes, and for slightly reducing or adjusting the pressureof the pressurized air and for preventing the pressurized air suppliedout through the nozzle and to the air facilities from beingover-pressurized.

Accordingly, the air compressor assembly in accordance with the presentinvention includes a cylinder housing having a compressing chamber forslidably receiving or engaging with a piston and having a bufferingcompartment formed in the cylinder housing and communicating with thecompressing chamber of the cylinder housing for partially receiving thepressurized air or for receiving a portion of the pressurized air andfor buffering purposes and for allowing the piston head to effectivelycompress or pump the air in the pumping movement or stroke and/or forsuitably increasing the compressing or pumping or pressurizing effect oroperation to the air.

Although this invention has been described with a certain degree ofparticularity, it is to be understood that the present disclosure hasbeen made by way of example only and that numerous changes in thedetailed construction and the combination and arrangement of parts maybe resorted to without departing from the spirit and scope of theinvention as hereinafter claimed.

I claim:
 1. An air compressor assembly comprising: a cylinder housingincluding a chamber formed therein and defined by an inner peripheralsurface, an outlet receptacle provided on said cylinder housing andincluding a bore formed therein, and including a partition providedbetween said cylinder housing and said outlet receptacle, and includingan air passage formed in said partition and communicating with saidchamber of said cylinder housing for receiving a pressurized air fromsaid chamber of said cylinder housing, and communicating with said boreof said outlet receptacle, and including a valve seat formed betweensaid cylinder housing and said outlet receptacle, a piston slidablyreceived in said chamber of said cylinder housing, a motor coupled tosaid piston for moving said piston relative to said cylinder housing ina reciprocating action in order to generate a pressurized air and forallowing the pressurized air to be supplied from said chamber of saidcylinder housing to said bore of said outlet receptacle, and aspring-biased check valve disposed in said outlet receptacle and engagedwith said valve seat and said partition for selectively blocking saidair passage of said partition and for guiding the pressurized air toflow from said chamber of said cylinder housing into said bore of saidoutlet receptacle, and to prevent the pressurized air from flowingbackwardly from said bore of said outlet receptacle into said chamber ofsaid cylinder housing, wherein: said partition includes a channel formedtherein and communicating with said chamber of said cylinder housing,and said cylinder housing includes a casing having a compartment formedin said casing and communicating with said channel of said partition forpartially receiving the pressurized air, and said piston is spaced andseparated from said partition of said cylinder housing for a distance(D) when said piston is moved toward said partition at a top deadposition, for forming and defining a space between said piston and saidpartition and for partially receiving the pressurized air.
 2. The aircompressor assembly as claimed in claim 1, wherein said cylinder housingincludes a regulating valve engaged in said compartment of said casingfor adjusting a volume of said compartment of said casing.
 3. The aircompressor assembly as claimed in claim 2, wherein said regulating valveincludes an adjusting member threaded and engaged with said casing foradjusting said volume of said compartment of said casing.
 4. The aircompressor assembly as claimed in claim 3, wherein said adjusting memberincludes a peripheral depression formed in an outer peripheral portionfor receiving and engaging with a sealing ring.
 5. The air compressorassembly as claimed in claim 1, wherein said cylinder housing includes aseparating panel provided between said casing and said outlet receptaclefor spacing and separating said compartment of said casing and said boreof said outlet receptacle from each other.
 6. The air compressorassembly as claimed in claim 1, wherein said outlet receptacle includesa duct communicating with said bore of said outlet receptacle forreceiving the pressurized air from said bore of said outlet receptacle.7. The air compressor assembly as claimed in claim 6, wherein saidcylinder housing includes a relief valve having a valve piece disposedand engaged in said duct for selectively blocking an air passage betweensaid duct and said outlet receptacle, and a fastener threaded andengaged with said duct for selectively enclosing said duct and forretaining said valve piece in said duct, said fastener includes anorifice formed therein, and an actuating knob includes a shank slidablyengaged in said orifice of said fastener and contactable and engageablewith said valve piece for selectively depressing said valve piece toselectively relieve the pressurized air.
 8. The air compressor assemblyas claimed in claim 1, wherein said cylinder housing includes a coverdetachably attached to said outlet receptacle, and said cover includes astem extended therefrom for engaging into said outlet receptacle and forengaging with said spring-biased check valve and for retaining saidspring-biased check valve within said outlet receptacle.
 9. The aircompressor assembly as claimed in claim 8, wherein said stem includes atleast one peripheral recess formed in an outer peripheral portion forforming and defining at least one peripheral flange and for engagingwith at least one sealing ring.